Both husband and wife can borrow 600,000 yuan to buy a house. Debt of 600,000 won't affect the debt capacity of both husband and wife, which needs to be evaluated according to the specific situation. The bank will comprehensively evaluate the debt capacity of both husband and wife according to their income, assets, liabilities and other factors, and determine the loan amount and loan interest rate according to the evaluation results. As long as both husband and wife have strong debt capacity, they can borrow money to buy a house.